Oceanographic data and ROV dive-related multimedia and information collected during the EX1202L3 (Gulf of Mexico Exploration) expedition on NOAA Ship OKEANOS EXPLORER in the Gulf of Mexico from 2012-04-11 to 2012-04-29 (NCEI Accession 0087995)

This dataset contains oceanographic data collected in the vicinity of the Deepwater Horizon site, Mississippi Canyon, and Green Canyon. Deepwater areas in the vicinity of the Flower Garden Banks were also explored. Daily schedules were split between daytime ROV operations (<4000 m) and nightly multibeam surveys. Nightly operations also included CTD casts. The initial portion of leg III focused on flux experiments using the ROV to ground-truth acoustic data. This expedition identified and explored the diversity of benthic habitats in the region, located and characterized submerged cultural resources and assessed their eligibility for the National Register of Historic Places, and improved capabilities to explore the water column.